Marker operation – Great Plains 1625AHL Operator Manual User Manual
Page 65
Great Plains Manufacturing, Inc.
Operating Instructions
61
2014-04-21
411-020M
Marker Operation
Electrocution Hazard:
Check for overhead lines before operating markers. If a
marker contacts an electrical line, all metal parts of the
planter and tractor can have lethal voltages present. There
may be no indication of this condition until a person completes
the circuit to ground. At higher voltages, electrocution can
occur without direct contact.
Before operating markers, make sure they are properly
bled as described in “Bleeding Hydraulics” on
page 115.
For markers to operate, the marker hydraulic circuit must
be enabled:
Refer to Figure 47
1.
At the Hydraulic Selector switch, push the rocker to
to “MARKER”
. Leave this switch in “MARKER”
position for all field operations.
The markers are equipped with a sequence valve to
control the lift sequence. Starting with both markers up,
the sequence is:
1.
Activate tractor hydraulic lever; right marker lowers
while left marker stays up.
2.
Reverse hydraulic lever; right marker raises while left
marker stays up.
3.
Activate hydraulic lever; left marker lowers while right
marker stays up.
4.
Reverse hydraulic lever; left marker raises while right
marker stays up.
5.
Pattern repeats.
Folding speed of dual markers is adjusted with
adjustment screws on sequence valve body. Because
excessive folding speed may damage markers, adjust
markers to a safe folding speed according to “Marker
Adjustments” on page 68.
Note: To get both markers in the lowered position at the
same time, activate hydraulic lever to lower one
marker. After marker is lowered, move lever to
opposite position then quickly reverse lever and
hold until other marker is lowered.
Figure 47
Hydraulic Selector Switches
34552
36230
M
M